How to Read an Air Conditioner's Energy Label

The label is regulated. Air conditioners sold in Australia must meet minimum efficiency standards under the Greenhouse and Energy Minimum Standards (GEMS) Act, overseen by the GEMS Regulator. [1] Since 2020, new non-ducted air conditioners must carry the Zoned Energy Rating Label, which replaced the older single-point label. [1]

Why "zoned" matters. The older label measured performance at a single outdoor temperature, which flattered some units and penalised others depending on the climate. [1] The Zoned Energy Rating Label instead rates the unit across three climate zones, hot, average and cold, so a buyer in Darwin and one in Hobart are genuinely looking at different numbers. [2]

Stars are efficiency, not power. The star rating tells you how efficiently a unit runs, not how much heating or cooling it delivers. Output capacity, shown in kilowatts, is the separate figure for the unit's actual power. [2]

Read the right climate column. The label shows a star rating and an estimated annual energy use in kilowatt hours for each of the three zones. [2] When an installer quotes savings, look at which climate column the figure comes from, because the hot-zone number can read very differently to the cold-zone one.

Capacity is shown at set temperatures. The label gives heating output at two outdoor temperatures and cooling output at one, so you can see how the unit holds up in tougher conditions, not just on a mild day. [2]

Noise is on there too. Indoor and outdoor noise are listed separately in decibels, because a quiet indoor unit paired with a loud outdoor compressor is still a noisy install. [2] The outdoor figure matters most if the unit will sit near a bedroom window or a boundary.

How stars compare like with like. A star rating is only meaningful between units of similar capacity. A five-star small split and a five-star ducted system are not measured on the same footing, and the scale tightens over time, so a five-star unit today is not the same as one from years ago. [2]

The number behind the stars. The rating is built on a seasonal efficiency measure, which weighs the energy a unit delivers against the energy it uses across a whole season rather than a single test point. [2] That is closer to how the unit behaves in a real home.

Knowing how to read the label puts you in control of the comparison. If you want help choosing a system that suits your home and climate, AC Wise connects you with vetted, licensed professionals across Australia.